the secrets are stored on servers around the world, beyond the reach of governments or law enforcement, then released worldwide on the internet. >> the u.s. does not have the technology to take the site down. >> because? >> just the way our technology is constructed, the way the internet is constructed. it's quite hard to stop things reappearing. so we've had attacks on particular domain names, little pieces of infrastructure knocked out. but we now have some 2,000 fully independent--in every way-- websites, where we are publishing around the world. >> wikileaks first caught the attention of most americans in april 2010, when it released this video. it shows a u.s. apache helicopter crew in iraq opening fire on a group of suspected insurgents who were standing on a street corner in baghdad. some of the men were armed, but two of them were journalists from reuters. >> come on, fire. [machine gun firing] >> yeah, roger. [machine gun firing] >> at least a dozen people were killed in that attack, some of them innocent civilians. then, that july, wikileaks released 76,000 classified field r